Tunable pure spin currents in a triple-quantum-dot ring

Abstract

Electron transport properties in a triple-quantum-dot ring with three terminals are theoretically studied. By introducing local Rashba spin-orbit interaction on an individual quantum dot, we calculate the charge and spin currents in one lead. We find that a pure spin current appears in the absence of a magnetic field. The polarization direction of the spin current can be inverted by altering the bias voltage. In addition, by tuning the magnetic field strength, the charge and spin currents reach their respective peaks alternately.

5 pages, 2 Figures

References in corpus (5)

• Dissipationless Quantum Spin Current at Room Temperature
• Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
• Fano-Rashba effect in a quantum wire
• Decoherence of transported spin in multichannel spin-orbit coupled spintronic devices: Scattering approach to spin density matrix from the ballistic to the localized regime
• Pure spin current from one-photon absorption of linearly polarized light in noncentrosymmetric semiconductors